Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a13fd328bf6d74…

MALICIOUS

PDF

67.0 KB Created: 2020-12-19 14:08:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8ff8bfdf5af5d4c467db915cca6d08fc SHA-1: cdeeabe72f5a1ca3f65558bc38a7cd70e17a35d6 SHA-256: 13a13fd328bf6d74e26188229e5eea2a2731c498d62688fffbe228874aa77cbc
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. An embedded URI points to a URL that appears to be part of a phishing lure, disguised as a teacher assistant cover letter. No scripts were extracted, but the presence of a malicious URI and the overall classification strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafficel.ru/strik?utm_term=sample+teacher+assistant+cover+letter+no+experience PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490375/normal_5fc0bd3767d97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408177/normal_5fcd20c181c1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381082/normal_5f9df8d32af81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392220/normal_5f939f237adc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382208/normal_5f912e8bec251.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/76da2c26-0a96-4aed-a480-7bd002bc72c1/kanosofanojuxiro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce26d8fd-cc57-4c18-952d-3bc64b5bf78b/pathfinder_cyclops_helm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a0d9ed2-c743-42ff-8bd0-a7c33cd67cde/varixoxowulalokomutuwizi.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/3032023638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cff108dc-339b-44b0-afda-82eb8a4f0974/22493941699.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/equivalent_fractions_for_2_5_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c0c21c8-a847-4ee4-89af-cebd4a0aba72/xigejidagukodedad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56a16204-2c8c-4cfe-b7a9-eceb1e0bc28b/sierra_vista_police_department_chief.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/4233583673.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA12 5404 bytes
SHA-256: f8a8cd2ac6e4f7715eabc187cdfc014fcfb93eef7c3be5dec67d1c677c68f48a
font_01_sfnt_off0000dc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4E 10184 bytes
SHA-256: c1f0522c0784536879bc6889a85bdc3726e0fe9b5d13c43292959f92a8f96a38

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